What makes the grisly discovery unique, however, is that the tower includes the skulls of women and children.

"We were expecting just men, obviously young men, as warriors would be, and the thing about the women and children is that you'd think they wouldn't be going to war," Rodrigo Bolanos, a biological anthropologist investigating the find, told Reuters.

The tower thought to be part of the ‘Huey Tzompantli’, a massive array of severed heads intended to warn off the invading conquistadors who eventually brought about the fall of the Aztec Empire in the 16th century.